<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        span{
            color: red;
        }
    </style>
    <link href="../CSS/CSS-Demo.css" rel="stylesheet">
</head>
<body>
<div style="color: red">hello CSS</div>
<span>hello CSS</span>
<br>

<p>我在这里</p>

</body>
</html>